20501706 has 8 divisors (see below), whose sum is σ = 41003424. Its totient is φ = 6833900.

The previous prime is 20501699. The next prime is 20501731. The reversal of 20501706 is 60710502.

It is a sphenic number, since it is the product of 3 distinct primes.

20501706 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1708470 + ... + 1708481.

It is an arithmetic number, because the mean of its divisors is an integer number (5125428).

Almost surely, 2^20501706 is an apocalyptic number.

20501706 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20501706 is a wasteful number, since it uses less digits than its factorization.

20501706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3416956.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20501706 is about 4527.8809613328. The cubic root of 20501706 is about 273.6927755118.

The spelling of 20501706 in words is "twenty million, five hundred one thousand, seven hundred six".